excuse the dumb title. I have a 97 Powerstroke with 123000 miles. When I drive the voltage sits right past the R in normal. When I switch my lights it drops in between O and R and if I use my window the needle jumps down and back up. Took the truck to a buddy and tested both batteries; one threw a bad batt and a bad alt on one battery. So I replaced the battery. It Threw good codes after but the guage still reads wierd.

P.S. Doing a tri pillar soon so I wanna solve it before I put more drawing amps in it.

sorry, I posted it before work so I was running late. I took the truck to a buddy and tested both batteries and the alternator. On one battery it threw a bad alternator code, but did not throw a bad alt code on the other; So I replaced to battery and no bad codes were thrown. The problem is still happening though.

^ Agreed. So with the engine running you are getting 14.2v at each battery?

I did a 12 volt load test and the new battery read 13.8V and the other battery read 11.3V. So I will replace the other battery. Since im doing a tri pillar should I consider a new alt anyway? I was gonna have a local shop rebuild and beef it up some. I have been reading about the ones from the auto shops and they dont seem to last very long. It would probably cost less for a rebuild and probably get a better warranty.

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